Convert EF3 to CG4

With our fast and user-friendly EF3 to CG4 converter, you can steer clear of the tedious task of manually converting multiple .ef3 files into cg4 format for hours on end.

reaConverter is an offline software designed for batch .ef3 to .cg4 conversion and editing. It supports a wide range of file formats and can convert multiple files at once.

Download
reaConverter
Convert
EF3 to CG4
Online
Convert

How to Convert Multiple EF3 Files to CG4?

1. Download and Install reaConverter

reaConverter is quick to download, install and launch. This standalone software is extremely efficient in managing a wide range of batch conversions. reaConverter is incredibly powerful and boasts an extensive variety of features.

reaConverter logo
Install reaConverter

2. Load your EF3 files

Start reaConverter and load all the .ef3 files you intend to convert into .cg4. The software supports multiple EF3 conversion and processes all files locally on your computer.

Select EF3s from a folder or by drag-and-dropping them directly into the reaConverter window.

Load your EF3 files into reaConverter

3. Select CG4 as output format

Pick the CG4 as output format and choose the destination folder where you want to save new .cg4 files.

Select CG4 as output format

4. Start EF3 to CG4 conversion

Then simply press Convert button and your conversion will begin in no time!

Screenshot

Once the conversion is complete, you can find your CG4 files in the destination folder you selected.

EF3 to CG4 Converter

reaConverter offers the fastest, simplest solution for converting your EF3 files into CG4 in seconds - all files processed on your PC for maximum privacy and speed.

Download Free Trial

Do more with your files

Converting EF3 files for use in a workflow? reaConverter offers many ways to process files, so you can customize them according to your requirements.

Our range of editing options includes auto-processing options such as auto-rotate, auto-crop, watermarking and more. Change Color Space, copy Metadata, set DPI, manage ICC Profile, control Bit Depth.

Conversion features
Image editing

User Reviews

Average User Rating:
Last updated on May 14, 2025
"reaConverter saved our team hundreds of hours by digitizing decades of CG4 archives in weeks—not months. Its resolution scaling preserved every detail, even in files older than some team members!"
⭐⭐⭐⭐⭐
Anna K.
Satisfied Customer
"We deployed reaConverter across our department to standardize file formats for our archives. The command-line support and automation features integrated perfectly into our systems. Stellar performance and zero crashes—it just works."
⭐⭐⭐⭐⭐
David R.
IT Solutions Architect
"So simple! I just needed to convert a couple of files to another format, and for such a straightforward task, the online converter worked perfectly — delivering the files I needed in no time. Excellent service!"
⭐⭐⭐⭐⭐
Kenneth D. Carter
Satisfied Customer
"I run a small design agency, and reaConverter has saved me countless hours. The batch processing is lightning-fast, and the ability to convert hundreds of files into different formats at once is a game-changer. Highly recommend!"
⭐⭐⭐⭐⭐
Mark T.
Satisfied Customer
"5/5⭐ Finally! Does what it promises - converts AND tweaks images without complicated menus. Perfect for quick jobs."
⭐⭐⭐⭐⭐
J. Mitchell
Satisfied Customer
"reaConverter is pure gold! Rock-solid performance with zero crashes. No internet needed—perfect for travel or low-connectivity work. The ultimate offline alternative to sketchy web converters. Plus, the desktop version keeps sensitive files secure since nothing ever gets uploaded to the cloud."
⭐⭐⭐⭐⭐
Malik T. Martin
Satisfied Customer

EF3 to CG4 Conversion: FAQ

What are EF3 files?

EF3 is a format associated with fax machines manufactured by Everex under the Everfax brand, which was fairly popular in the late 1980s. EF3 files contain images of sent and received documents and might be difficult to open using regular image viewers. Everex was well known as a manufacturer of tape drives, graphic boards, DTP products and other computer devices throughout the 1980s, but its success decreased in time. After filing for bankruptcy, the company was acquired by New Market Technology in 2008 and now continues to produce desktop computers and notebooks.

What are CG4 files?

CG4 is a raster format associated with CALS (Continuous Acquisition and Life-Cycle Support) — a program initiated by the US Department of Defense to capture and link military data. CG4 is compatible with a very limited number of digital graphics programs. Files with this extension contain a bitmap that often uses the CCITT4 compression, which is an old fax machine standard used for black-and-white images.

Can reaConverter convert EF3 to CG4?

Yes! reaConverter instantly converts .ef3 to .cg4 with perfect quality preservation. With its batch processing feature, you can convert multiple files at once in just a few clicks. You can even convert images directly from Windows Explorer using the right-click menu — fast and convenient.

Can I convert EF3 to CG4 online?

If you only need to convert a few EF3 files to CG4 format, feel free to try our free online free online EF3 to CG4 converter — perfect for small batches with no installation needed!

How can I turn EF3 files into CG4 on my computer?

The best way to change EF3s to CG4s on your PC is to install a quality piece of software, such as reaConverter. This software is extremely efficient in managing a wide range of batch files conversions, including conversion from EF3 to CG4.

How can I automate EF3 to CG4 files conversion?

reaConverter supports all the most useful automation features such as right-click сonversion and Watch Folders for the most efficient automated files conversion in any software of this type.

Is there a way to convert EF3 files to CG4 using the command prompt?

reaConverter provides full access to all its features via Windows command line, including a high-performance command-line ef3 to cg4 converter for batch processing.

What else can I do with reaConverter?

Convert RAW photo formatsCopy IPTC dataConvert vector imagesConvert picture color spaceConvert PDF

Find out more

Get advanced software for file conversion, processing, and editing, giving you complete, precise control over your work.
Download
reaConverter
Buy Now
reaConverter software
OSZAR »